EARISE Q8 USB Powered Computer Speakers 2.1 Subwoofer Independent high and low bass adjustment9W (5W+2Wx2)(RMS) Nominal Impedance: Bass host speaker 2 OHM, Satellite speaker 4 OHM Frequency Response: Bass host speaker 30Hz ~ 200Hz, Satellite speaker 180Hz ~ 20 KHz Degree of Distortion: 0.3% &lt; 1W/1KHz, Degree of Separation:  45dB, Signal to Noise Ratio (SNR) :  60dB Power Supply: USB/DC 5V; Electroplating knob button; piano lacquer panels and scrub body. Antimagnetic design.